Bus bar supporting means in bus duct



June 22, 1937. w. H. FRANK 2,084,580

BUS BAR SUPPORTING MEANS IN BUS DUCT Filed Aug. 31 1935 4 Sheets-Sheet 1INVENT OR.

' A J w.

W ATTORNEY.

June 22, 1937. w. H. FRANK BUS BAR sunonune MEANS IN BUS DUCT Filed Aug.31. 1935 v 4 Sheets-Sheet 2 INVENTOR. M A 54% BY ATTORNEY.

June 22, 1937. w. H. FRANK BUS BAR SUPPORTING MEANS IN BUS DUCT FiledAug. 51, 1935 4 Sheets-Sheet 3 IN VENTOR.

ATTORNEY.

v June 22. 1937. v w, FRANK I Q 2,084,580

BUS BAR SUPPORTING MEANS IN BUS DUCT Filed Aug. 31, 1955 4 Sheets-Sheet4 ATTORNEY.

INVENTOR.

Patented June 22, 193? FHCE fifiildfifiii IEIUS EAR SWEFORTING MEAN S INBUS DUCT It (Claim.

This application relates to electrical distribution systems. The subjectmatter of this application was originally disclosed to the Patent Officein application Serial No. 735,743, filed July 18,

5- 1,934, which issued as Patent No. 2,009,376 of July 23, 1935 and wasalso disclosed in. an application Serial No. 31,296, filed July .13,1935, which issued into Patent No. 2,059,988oi November 3, i936, and itis here claimed that the subject matter of this application is entitledto the benefit of the filing date of Serial No. 735,743, filed July 18,19%. i

The inventions of the present application relate to novel details of busbar insulating and supporting means and these details can best beunderstood in connection with the appended drawings. in these drawings,

Figure l is a transverse sectional view of a bus-duct showing anarrangement using pedestal 20 type insulators, instead of the flat basetype insulators heretofore shown in application Serial No. 31,296;

Figure 2 shows a bus bar supported on a pedestal type insulator;

Figure 3 is a cut-away fragmentary plan view of ,a bus-duct showing busbars supported on relatively staggered pedestal type insulators;

Figures 4, 5, 6, 7, 8, 9, i0, 11, 12 and 13 show alternate arrangementsof bus bars on pedestal type insulators.

In Figures 1, 2 and 3 there is shown an arrangement employing pedestaltype insulators 50 for supporting three bus bars in a bus-duct. Theinsulators may be positioned in the bus-duct in staggered relation,Figure 3, for promoting space economy, and each pedestal is bolted tothe lower section half by bolts 5|, whose heads are sealed from theupper surface of the pedestal by gobs of sealing wax 52 in counterboresof the pedestal. Bolts 53 project upwardly from each pedestal and havetheir heads sealed from the section half upon which the pedestal isplaced by gobs 54 of sealing waxin counterbores of the pedestal. When apedestal is to support one bus bar only, as in Figures 1-3, the pedestalis provided with a lower U-shaped clip 55, through which passes thebolts 53. The bus bar 24 is laid in one' portion of the clip 55,adjacent the bolt 53, and 'an'upper U-shaped clip 56 is positioned onthe bolts to receive the upper edge of the bus bar.

A spacer 51 of the size of the bus bar is'positioned in the otherportions of the clips -56 and a nut 58 is threaded down on each bolt 5355 to complete the assembly.

(oi. its-31s) If desired, the spacer 51 may be replaced by another busbar, as, for example, when it is desired to utilize two bus bars foreach pole of the system.

. 53 measuring the capacity of the pedestal type 15 insulator.

figure 5 shows a pedestal type insulator supporting four bus bars. Inthis case, each of the clips (32 has two pairs of spacer lugs 63, andthese are utilized in substantially the fashion 2o shown.

Figure 6 shows a pedestal type insulator arranged with its major axistraversing the bus bars, instead of running along the bus bars, for thepurpose of enabling the single pedestal to. 25 support as many as sixbus bars; the clips 6t used in this case each have three pairs of spacerlugs 65.

In Fig. 7,. a pedestal type insulator is shown as supporting a bus barlaid flat on the pedestal, 30 being spaced therefrom by a spacinginsulating washer 56. It is observed that as many bus bars as desiredmay be utilized in this fashion, being placed one uponthe other,depending upon the length of the bolts 53 and the number of 35 washers65.

Figure 8 shows a pedestal type insulator used to support two bus barswhich are of channeled cross-section, the assembly including wide clips61 to accommodate the channel-shaped bus bars. In this case it isintended that both bus bars form one pole of a multiple bus duct.

Figure 9 shows a pedestal type insulator arranged with its major axistransverse of the bus bars, so that the pedestal may support twochannel-shaped bus bars on insulating washers 58; the bus bars arespaced from each other and may be of the same or opposite polarity asdesired.

Figure 10 shows a pedestal type insulator supporting four bus bars whichare assembled to form what amounts to a hollow conductor of squarecross-section. In this case wide clips 69 and insulating washers 10 areutilized as shownf 55 15 reducing the induction effect.

The value of this arrangement lies in the fact that it provides maximumcurrent capacity per unit of bus bar' cross-sectional area, for, as iswell known, in a large capacity conductor, most 5 of the current iscarried by the outside portion of the conductor.

Figure 11 shows an arrangement for substantially the same purpose, butwherein only three bus bars are utilized, the clips H and 12 serving towedge all three bus bars into a tight assembly.

Figure 13 shows a pedestal type insulator having bolts 14 ofiset fromthe centerline of the insulator to receive between them a bus bar 15,there being a clamping plate 16 traversing the bus bar and clamped bythe nuts of the bolts. This arrangement requires no spacer, such as isshown at 51, Figure 2, and is very satisfactory for an odd number of busbars. If three or more bus bars be used, two or more of them may be onthe outside of the bolts, and the remaining one disposed as shown.

If desired, the holes in the pedestal, receiving the bolts, may beformed as slots, in which case," the bolts may be positioned on center,as in Figure-2, or of! center, as in Figure 13, at the option of theinstaller of the system.

Now having described novel details and arrangements of bus bar insulatorand supporting means of the bus duct shown in this application referencewill be had to the following claim which determines the scope of theinventions of this application.

What I claim is:

An electrical distribution bus-duct having an elongated bus run spacedfrom a wall of the elongated duct, bus run supports comprising aplurality of separate spaced identical insulator pedestals disposedagainst that wall, each pedestal having a pair of bolts projecting fromone surface thereof and through that wall of the duct, for securing thepedestal to that wall, with each bolt having its head embedded withinthe pedestal, each pedestal having means for securing the bus run to thepedestal, comprising a pair of bolts projecting from a surface of thepedestal opposite the first mentioned surface, with each of these boltshaving its head embedded within the pedestal, the line connecting eachpair of bolts being .transverse to and intersecting that connecting theother pair of bolts, and being between the other pair of bolts.

WILLIAM H. FRANK.

